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bearings

Before you cut them off, which you may have to. Spray the shaft with wd40 and clean with sand cloth while it's running. Tap bearing down on shaft to clean under where it sat on shaft and then maybe you can move it back up and off the shaft. P. S. File the set screw markes off the shaft too. Just takes time.

Heat the shaft and bearing with a torch. Douse with water. Heat again and douse. Spray with Kroil or WD40 for lubrication. The difference in metal density will cause the bearing and shaft to expand and contract at different rates. This will cause the bearing to break free from the shaft for easy replacement....

edit.... if the shaft and bearing smoke when you spray it is too hot, wait until it cools

Use sand cloth and a file if needed to polish the shaft from the end, down to the bearing, and 2" below the bearing. Oil it and drive the bearing down on the spot you cleaned below it. Clean the spot where the bearing was and file any rough spots. Oil again and slide it right off.

I will have to do this on thanksgiving day, rain or shine, This is for a college and this is the only day the kitchen is not cooking till xmas. to make matters worse it's the only hood fan they have, every hood is connected to this one fan. How stupid is that but it is 45 years old.

I never have put a pillow block down a shaft 24" I have done pillows before but not 24" I will sand the shaft will running, oil good, cut the old ones but how do you push it 24" down the shaft???????, a block of wood with a hole in it?????? Hollow pipe?????

2 in house guys replaced the easy bearing on the end of the shaft 3 months ago but left the 24" hard bearing on with metal shavings pooring out . It took the two all day for the one easy bearing so now they will not trust them for the hard one to do so I get to do it on Thansgiving!

as a truck/ reefer mechanic; I did what lusker says except I heated the parts and cooled them with panther piss once or twice- worked almost every time !!!or jar stuff loose with a smack of a punch and hammer

Worked on a couple of these. Sand and CLEAN the shaft VERY WELL and the new bearing should slide right down the shaft. If you oil the shaft lightly it will help. Too much oil on the shaft will cause a suction seal and make the bearng harder to move. If the shaft is damaged it should be replaced or repaired. I worked on an air handler at a large church that had the brick and stone work put up AFTER the equipment went in .... no way to extract the 10' long shaft that was damaged by a spun bearing. Welding and grinding were not an option. Found an epoxy product from Belzona Moutain States (http://www.belzonamsd.com) which allowed me to repair the shaft in place. I have used this company's products for years, but this was new to me. I rebuilt the shaft with epoxy and it has now been in service with the new bearing for 5 years. Hope this helps.